Name:	ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The exercise price of share options granted.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_a_i&doctype=Standard
-URIDate 2019-03-27

Name:	ifrs-full_ExercisePriceShareOptionsGranted2019
Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

The amount of expense from share-based payment transactions with employees.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2019-03-27

Name:	ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The nominal value per share.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 79
-Subparagraph a
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_79_a_iii&doctype=Standard
-URIDate 2019-03-27

Name:	ifrs-full_ParValuePerShare
Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

No definition available.

Name:	jmia_IfrsShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod
Namespace Prefix:	jmia_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	jmia_IfrsShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationPeriod
Namespace Prefix:	jmia_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The number of beneficiaries under the share-based compensation plan whose grant date differed from that of other beneficiaries.

No definition available.

Name:	jmia_ShareBasedCompensationNumberOfBeneficiariesWithAlternativeGrantDate
Namespace Prefix:	jmia_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The number of types of awards under the share-based payment plan.

No definition available.

Name:	jmia_ShareBasedCompensationNumberOfTypesOfAwards
Namespace Prefix:	jmia_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The number of vesting conditions for the awards group under the share-based payments plan.

No definition available.

Name:	jmia_ShareBasedCompensationNumberOfVestingConditions
Namespace Prefix:	jmia_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The number of vesting groups in the share-based payments plan.

No definition available.

Name:	jmia_ShareBasedCompensationNumberOfVestingGroups
Namespace Prefix:	jmia_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The number of shares of the entity's stock to be received for each option granted under the share-based compensation plan.

No definition available.

Name:	jmia_ShareBasedCompensationPlanNumberOfSharesCalledByEachOption
Namespace Prefix:	jmia_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The forfeiture period upon termination of employment for options granted under the share-based compensation plan.

No definition available.

Name:	jmia_ShareBasedCompensationPlanOptionsForfeiturePeriodUponTerminationOfEmployment
Namespace Prefix:	jmia_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The minimum annual growth in sales volume necessary in order to exercise options granted under the share-based compensation plan.

No definition available.

Name:	jmia_ShareBasedCompensationPlanOptionsMinimumAnnualGrowthInSalesVolumeForExercise
Namespace Prefix:	jmia_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The number of beneficiaries subject to vesting exceptions under the share-based compensation plan.

No definition available.

Name:	jmia_ShareBasedCompensationPlanOptionsNumberOfBeneficiariesSubjectToExceptionsToVestingArrangement
Namespace Prefix:	jmia_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The number of tranches for the beneficiaries subject to vesting exceptions under the share-based compensation plan.

No definition available.

Name:	jmia_ShareBasedCompensationPlanOptionsNumberOfTranchesForBeneficiariesSubjectToVestingExceptions
Namespace Prefix:	jmia_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The number of vesting tranches for options granted under the share-based compensation plan.

No definition available.

Name:	jmia_ShareBasedCompensationPlanOptionsNumberOfVestingTranches
Namespace Prefix:	jmia_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The period during which former management beneficiaries incept work for a competitor of the entity which triggers forfeiture of unexercised options granted under the share-based compensation plan.

No definition available.

Name:	jmia_ShareBasedCompensationPlanOptionsPeriodTriggeringForfeiture
Namespace Prefix:	jmia_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The waiting period that must expire before options granted under the share-based compensation plan can be exercised.

No definition available.

Name:	jmia_ShareBasedCompensationPlanOptionsWaitingPeriod
Namespace Prefix:	jmia_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The probability of vesting of awards under the share-based compensation plan, prior to the Initial Public Offering.

No definition available.

Name:	jmia_ShareBasedCompensationPlanProbabilityOfVestingPriorToIpo
Namespace Prefix:	jmia_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The increase in share capital authorized by the entity as part of restructuring process.

No definition available.

Name:	jmia_ShareCapitalIncrease
Namespace Prefix:	jmia_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_StatementScenarioAxis=jmia_VestedInFullAfterCliffPeriodMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_StatementScenarioAxis=jmia_VestInFullOneYearAfterExitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: